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MAJOR bugfix from 2.6. I got a patch for PostgreSQL support and didn't realize it had created a bug in the double entry system for two-way relationships.
Please upgrade and make sure you run update.php to fix any errors that may have come been created. I sincerely apologize for not catching this earlier.
New features for the Privatemsg plugin: Notifications can now be sent through the private message system. Thanks for the suggestion from softtouch: http://drupal.org/node/225707